The following passwords were contributed by GameFAQs users Sabin99992000 and zombiehunting84.

Green Locker Passwords

When you reach a green locker type in the password:

Effect

Password

Unlock Nail Gun and Double Axe

171678

Unlock Pistol 45 and Baseball Bat

353479

Unlock Rifle and Golf Club

911977

Secret Endings

The game has two secret endings that can be obtained by completing the game under certain conditions (credit to Sombrero_Shadow)

Unlockable

How to Unlock

Secret Ending 1

Complete the game once and during your second playthrough complete the "Digging Up the Past" side-quest before completing the game

Secret Ending 2

Die during the final encounter

Henry Townshend's apartment from Silent Hill 4: The Room

Henry's apartment can be found on Landsdale Ave. between Brite St. and Cook St. To find it, look for two bright windows with a ladder from above. You have to pull the ladder down with the right weapon; then, climb up and enter the window.

Jukebox Silent Hill 1 theme music

When you reach the diner in the first portion of the game, look for the cash register behind the bar area. Grab the coins and put them in the jukebox in the corner of the room, and the theme from the very first Silent Hill will play. You should remember it, right?